<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="./css/index.css" />
    <title>记事本</title>
</head>

<body>

    <!-- 主体区域 -->
    <section id="app">
        <!-- 输入框 -->
        <header class="header">
            <h1>小黑记事本</h1>
            <input placeholder="请输入任务" class="new-todo" v-model="target" />
            <button class="add" @click="add">添加任务</button>
        </header>
        <!-- 列表区域 -->
        <section class="main">
            <ul class="todo-list">
                <li class="todo" v-for="(item,index) in list" :key="item.id">
                    <div class="view">
                        <span class="index">{{item.id}}.</span> <label>{{item.name}}</label>
                        <button class="destroy" @click="del(item.id)"></button>
                    </div>
                </li>
            </ul>
        </section>
        <!-- 统计和清空 -->
        <footer class="footer">
            <!-- 统计 -->
            <span class="todo-count">合 计:<strong> {{list.length}} </strong></span>
            <!-- 清空 -->
            <button class="clear-completed" @click="rem">
      清空任务
    </button>
        </footer>
    </section>

    <!-- 底部 -->
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>
        const app = new Vue({
            el: '#app',
            data: {
                list: [{
                    id: 1,
                    name: '跑步20'
                }, {
                    id: 2,
                    name: '跑步300'
                }],
                target: ''

            },
            methods: {
                del(x) {
                    //删除功能
                    const newArr = this.list.filter(ele => {
                        return ele.id !== x
                    })
                    this.list = newArr

                },
                add() {
                    //添加功能
                    this.list.push({
                        id: this.list.length + 1,
                        name: this.target
                    })
                    this.target = ''
                },
                rem() {
                    this.list = ''

                }
            }
        })
    </script>
</body>

</html>